Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 688, Issue -, Pages 505-523Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.02.019
Keywords
Carbon nanotubes; High energy ball milling; Spark plasma sintering; Titanium matrix composites; Microstructure; Raman spectroscopy
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Funding
- National Health and Medical Research Council (NHMRC) [GNT1087290]
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The influence of various dispersion methods on the evolution of multi-walled carbon nanotubes (MWCNTs) in titanium (Ti) metal matrix composites (TMCs) prepared via spark plasma sintering (SPS) have been investigated. The synthesis procedures included sonication, high energy ball milling (HEBM), and rapid consolidation of powder mixtures at different sintering temperatures. The impact energy provided to the powder mixtures during HEBM process was optimized to disperse 0.5 wt% MWCNTs into Ti matrix in two controlled ball milling processes: with and without in-situ formation of TiC during HEBM. The interfacial reactions between MWCNTs and Ti matrix were controlled by retaining the crystallinity and sp(2) carbon network of the MWCNTs even at high sintering temperature of 800 degrees C, which enhanced their compressive strength up to 1056 MPa with a compressive strain of 27.31%. The mechanical and tribological properties of the composites consolidated from the powder mixtures with in-situ TiC formation during HEBM and pre-sonicated MWCNTs were significantly enhanced as opposed to the composites consolidated from the powder mixtures without formation of TIC during HEBM.
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